Apart from being lame, is she mature in her thinking? 
Reason for asking if she's mature is, since both of
you are good friends, even if she don't have any slightest feeling
for you, things should be back at ground zero - friendship. Unless
she's got a childish mentality, then I'm sorry, chances are it'll
affect your friendship. Of coz the above situation is dependant on
the individuals.
A girl can clique really well with a guy, yet it's purely platonic.
But to a guy, there's hardly a thing call platonic r/s if you ask
me. There is bound to have certain attraction, be it in its
slightest form. 
You mentioned 'some feelings', how
strong are these feelings? Maybe you like her as a friend and
nothing more that that?
Maybe you should learn to bid for your time.. It's not as if now
you must go into a r/s with her. Since both of you are good friends
and chances are both of u enjoy each other's company, why not make
use of every opportunity to know her better?
Stop cracking lame jokes, time to be serious if you think she's the
one. Coz if you carry on being a lamer *pardon me for that* even
when the day comes where you tell her you like her, she'll take it
as yet another lame joke, if you get what I'm trying to say here.
How old are you and she by the way? How long have you both known
each other?
